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See in the Modding Documentation folder, the file, AI Files Modifiers.txt. This will explain it all. Basically you change the value of your item of interest and then play the game to see the effect.
You can also look at the AI files in the AI or switch folder in dh and find whatever you need probably in there already.
You need to use Notepad++ to open these files easily. It is a free program. With notepad++ installed you can just right click on the file and "open with notepad++".